diff --git a/BSP/linux-kernel/drivers/tty/tty_io.c b/BSP/linux-kernel/drivers/tty/tty_io.c
index a7335f7a7..2a8cb62bd 100755
--- a/BSP/linux-kernel/drivers/tty/tty_io.c
+++ b/BSP/linux-kernel/drivers/tty/tty_io.c
@@ -1043,7 +1043,10 @@ static ssize_t tty_write(struct file *file, const char __user *buf,
 	else
 		ret = do_tty_write(ld->ops->write, tty, file, buf, count);
 #ifdef CONFIG_LOGFILE
-	logfile_save_str((char *)buf, count, 0);
+	if(!strstr(file->f_path.dentry->d_name.name, "USB"))
+    {
+            logfile_save_str((char *)buf, count, 0);
+    }
 #endif
 	tty_ldisc_deref(ld);
 	return ret;